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    <title>Document</title>
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  <body>
    <script>
      // const arr = [100, 60, 80]
      // 数组解构 赋值
      // // const [max, min, avg] = arr
      const [max, min, avg] = [100, 60, 80];
      // // const max = arr[0]
      // // const min = arr[1]
      // // const avg = arr[2]
      console.log(max); // 100
      console.log(avg); // 80
      // 交换2个变量的值
      let a = 1;
      let b = 2; // 加分号
      [b, a] = [a, b];
      console.log(a, b);
    </script>
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